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Paul Bernays was born on October 17, 1888 in London, Swiss, is Mathematician. Paul Isaac Bernays was a famous Swiss mathematician who made noteworthy contributions to the philosophy of mathematics and developed a new discipline of mathematical logic. Foremost among his work was the proof theory and the axiomatic set theory. Born in London, he grew up in Paris and Berlin. As a child, he showed a keen interest in music as well as ancient languages and mathematics. In college, he majored in mathematics and also studied philosophy and theoretical physics as additional subjects. At the age of 24, he received his doctoral degree in mathematics from the University of Berlin. He also obtained his Habilitation from the University of Zurich and became a Privatdozent there. Soon, he joined David Hilbert as his research assistant in investigating the foundations of arithmetic. Eventually, he was awarded the Venia Legendi at the University of G¨ottingen but lost the post during Second World War due to his Jewish ancestry. He finally moved to Switzerland where he taught at the Eidgen¨ossische Technische Hochschule, Z¨urich. He is best remembered for his joint two volume work ‘Grundlagen der Mathematik’ (1934-39) with Hilbert, and his Axiomatic Set Theory which was published in 1958.

** Paul Bernays is a member of Scientists**

Who is it? | Mathematician |

Birth Day | October 17, 1888 |

Birth Place | London, Swiss |

Age | 131 YEARS OLD |

Died On | 18 September 1977(1977-09-18) (aged 88)\nZurich, Switzerland |

Birth Sign | Scorpio |

Alma mater | University of Berlin |

Known for | Mathematical logic Axiomatic set theory Philosophy of mathematics |

Fields | Mathematics |

Thesis | Über die Darstellung von positiven, ganzen Zahlen durch die primitiven, binären quadratischen Formen einer nicht-quadratischen Diskriminante (1912) |

Doctoral advisor | Edmund Landau |

Doctoral students | Corrado Böhm Julius Richard Büchi Haskell Curry Erwin Engeler Gerhard Gentzen Saunders Mac Lane |

Influences | Issai Schur, Edmund Landau |

1895

Bernays spent his childhood in Berlin, and attended the Köllner Gymnasium, 1895-1907. At the University of Berlin, he studied mathematics under Issai Schur, Edmund Landau, Ferdinand Georg Frobenius, and Friedrich Schottky; philosophy under Alois Riehl, Carl Stumpf and Ernst Cassirer; and physics under Max Planck. At the University of Göttingen, he studied mathematics under David Hilbert, Edmund Landau, Hermann Weyl, and Felix Klein; physics under Voigt and Max Born; and philosophy under Leonard Nelson.

1912

In 1912, the University of Berlin awarded him a Ph.D. in mathematics, for a thesis, supervised by Landau, on the analytic number theory of binary quadratic forms. That same year, the University of Zurich awarded him the Habilitation for a thesis on complex analysis and Picard's theorem. The examiner was Ernst Zermelo. Bernays was Privatdozent at the University of Zurich, 1912–17, where he came to know George Pólya.

1917

Starting in 1917, David Hilbert employed Bernays to assist him with his investigations of the foundations of arithmetic. Bernays also lectured on other areas of mathematics at the University of Göttingen. In 1918, that university awarded him a second Habilitation, for a thesis on the axiomatics of the propositional calculus of *Principia Mathematica*.

1922

In 1922, Göttingen appointed Bernays extraordinary professor without tenure. His most successful student there was Gerhard Gentzen. In 1933, he was dismissed from this post because of his Jewish ancestry. After working privately for Hilbert for six months, Bernays and his family moved to Switzerland, whose nationality he had inherited from his father, and where the ETH employed him on occasion. He also visited the University of Pennsylvania and was a visiting scholar at the Institute for Advanced Study in 1935-36 and again in 1959-60.

1934

Bernays's collaboration with Hilbert culminated in the two volume work Grundlagen der Mathematik by Hilbert and Bernays (1934, 1939), discussed in Sieg and Ravaglia (2005). In seven papers, published between 1937 and 1954 in the *Journal of Symbolic Logic*, republished in (Müller 1976), Bernays set out an axiomatic set theory whose starting point was a related theory John von Neumann had set out in the 1920s. Von Neumann's theory took the notions of function and argument as primitive; Bernays recast von Neumann's theory so that classes and sets were primitive. Bernays's theory, with some modifications by Kurt Gödel, is now known as von Neumann–Bernays–Gödel set theory. A proof from the *Grundlagen der Mathematik* that a sufficiently strong consistent theory cannot contain its own reference functor is now known as the Hilbert–Bernays paradox.

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